fix: 放开上传大小限制，并让前端可以访问后端资源

frontend/nginx.conf

@@ -2,6 +2,9 @@ server {
   listen 80;
   server_name _;
 
+  # Allow large uploads (e.g. videos)
+  client_max_body_size 300m;
+
   root /usr/share/nginx/html;
   index index.html;
 
@@ -14,10 +17,21 @@ server {
   location /api/ {
     proxy_pass http://backend:8080/;
     proxy_http_version 1.1;
-    proxy_set_header Host $host;
+    # Keep original Host (incl. port) so backend can generate correct absolute URLs
+    proxy_set_header Host $http_host;
     proxy_set_header X-Real-IP $remote_addr;
     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
     proxy_set_header X-Forwarded-Proto $scheme;
   }
-}
 
+  # Serve uploaded files via backend static route
+  location /static/ {
+    proxy_pass http://backend:8080/static/;
+    proxy_http_version 1.1;
+    proxy_set_header Host $http_host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Proto $scheme;
+    proxy_buffering off;
+  }
+}